Wan-Rong Geng, Xiangwei Guo, Yin-Lian Zhu, Desheng Ma, Yun-Long Tang, Yu-Jia Wang, Yongjun Wu, Zijian Hong, Xiu-Liang Ma. "Observation of multi-order polar radial vortices and their topological transition." Nature Communications, 2025. doi:10.1038/s41467-025-58008-w